Development of a bellmouth airflow measurement technique for turbine engine ground test facilitiesDevelopment of a bellmouth airflow measurement technique for turbine engine ground test facilities
【title】：Development of a bellmouth airflow measurement technique for turbine engine ground test facilitiesDevelopment of a bellmouth airflow measurement technique for turbine engine ground test facilities 【作者】：Beale, D. K.^Hand, T. L.^Sebourn, C. L. (Arnold Engineering Development Center, Arnold AFB, TN) 【Corportate Author】：【Catalog】：7535 Instrumentation & Photography (1975-)|【Keywords】：TURBINE ENGINES; ENGINE TESTS; AIR FLOW; GROUND TESTS; TEST FACILITIES; FLOW MEASUREMENT; COST REDUCTION; FLOW COEFFICIENTS; MACH NUMBER; FLOW DISTRIBUTION【Publish Year】： 【Language】：English【Record id】：2001-3676【File Size】：2.97M 【Come From】：AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 37th, Salt Lake City, UT, July 8-11, 2001, 21 p..【AAIA ID】：A0134358 【Abstract】：The Amold Engineering Development Center (AEDC) initiated an airflow measurement technique investigation to address turbine engine test requiremens with respect to both accuracy and cost of air flow measurement. ^This paper focuses on the development of the bellmouth as a lower cost alternative to the choked venturi for measuring airflow indirect-connect turbine engine tests. ^The effort encompassed the development of a research test cell to serve as an airflow calibration facility, the testing of bellmouth models, the application of computational fluid dynamics (CFD) to the prediction of bellmouth flow characteristics and flow coefficients, and the validation of CFD through comparison with experiment. ^Results presented begin with comparisons of the computed and measured bellmouth boundary-layer total pressure profiles, as well as the core flow Mach number distributions. ^Next, the computed flow coefficients are shown in conjunction with comparisons to experiment. ^Finally, the paper shows comparisons between the airflow measured with the bellmouth, using the computed flow coefficients, and airflow measured with a calibrated reference venturi. ^The results show that with careful selection of the static pressure measurement plane, the bellmouth offers a promising alter native to the venturi for airflow measurement in turbine engine tests. ^(Author)
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